libcxx/test/std/input.output/iostreams.base/ios/iostate.flags/fail.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <ios>
  10
  11 // template <class charT, class traits> class basic_ios
  12
  13 // bool fail() const;
  14
  15 #include <ios>
  16 #include <streambuf>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 struct testbuf : public std::streambuf {};
  22
  23 int main(int, char**)
  24 {
  25     {
  26         std::ios ios(0);
  27         assert(ios.fail());
  28         ios.setstate(std::ios::eofbit);
  29         assert(ios.fail());
  30     }
  31     {
  32         testbuf sb;
  33         std::ios ios(&sb);
  34         assert(!ios.fail());
  35         ios.setstate(std::ios::eofbit);
  36         assert(!ios.fail());
  37         ios.setstate(std::ios::badbit);
  38         assert(ios.fail());
  39         ios.setstate(std::ios::failbit);
  40         assert(ios.fail());
  41     }
  42
  43   return 0;
  44 }